A Grenade is a hand-held explosive weapon triggered by the pull of a pin.
In Dragon Ball, Mercenary Tao attempts to kill Goku by throwing a grenade at the young Saiyan. After it is thrown, Tao jumps into the air to avoid the explosion, but Goku kicks it up into the air, and it explodes almost directly in front of Tao.
Appearances in video games
In video games, grenades are most often used by Mr. Satan.
In Dragon Ball Z: Ultimate Battle 22 and Dragon Ball Z: Shin Butōden, as he cannot use Ki Blasts, Mr. Satan instead throws grenades. In the Budokai Tenkaichi series, both Mercenary Tao and Mr. Satan grenades as a charged-ki attacks (Mr. Satan's still uses them in place of ki blasts).
As a support-type character in Dragon Ball Z: Supersonic Warriors 2, Mr. Satan throws volley of grenades at the fighter's opponent.